Transcript 7 - Lps.org
+
Fundamentals of the Nervous System
and Nervous Tissue
+
The nervous system has three
overlapping functions. Which of the
following represents a logical
sequence of these three functions?
a. sensory input, motor output, integration
b. motor output, integration, sensory input
c. sensory input, integration, motor output
d. integration, sensory input, motor output
+
While studying for an exam, you reach
for a beverage. To extend your arm,
your _______ nervous system is
activated.
a. afferent
b. autonomic
c. sympathetic
d. somatic
+
The door slams shut loudly and you
flinch. After a few seconds, you realize
that your heart is beating very rapidly
and forcefully. This response is the
result of your ______ nervous system.
a. afferent
b. sympathetic
c. central
d. somatic
+
Complete the following analogy:
electrical wire is to electrical tape as
peripheral neurons are to________.
a. Schwann cells
b. oligodendrocytes
c. astrocytes
d. ependymal cells
+
Each neuron in our bodies has an
estimated lifespan of _________.
a. 120 days
b. 10 years
c. 10 months
d. an average human lifespan
+
“Nerves” are found in the ______ while
“tracts” are found in the ________.
a. PNS… CNS
b. CNS… PNS
c. brain… legs and arms
d. spinal cord… brain
+
The portion of an axon that contacts its
target is the _______.
a. dendrite
b. axon
c. axon terminal/end knob
d. cell body
+
The basis for differentiation between
gray matter and white matter in the
CNS is the presence of _______ in white
matter.
a. unmyelinated fibers
b. myelinated fibers
c. Schwann cells
d. oligodendrocytes
+
The ________ neurons comprise the
most common structural type of neuron
in humans.
a. psuedounipolar
b. unipolar
c. bipolar
d. multipolar
+
Sodium ion concentration in the
cytoplasm of a neuron ________
when its voltage-gated potassium
channels open.
a. increases
b. decreases
c. remains unchanged
d. increases 10x
+
Sodium ion concentration in the
cytoplasm of a neuron ________
when its voltage-gated sodium
channels open.
a. increases
b. decreases
c. remains unchanged
d. decreases 10x
+
The voltage displayed across a
resting neuron membrane is
termed the ________.
a. action potential
b. excitatory potential
c. resting membrane potential
d. depolarized potential
+
The point at which the all-or-none
principle of action potential
generation is reached is termed
the ________.
a. peak
b. depolarization point
c. threshold
d. point of no return
+
Stronger stimuli are interpreted
when the CNS receives ________
action potentials.
a. higher magnitude
b. more frequent
c. lower magnitude
d. infrequent
+
The location at which a neuron
interacts with its target (either
another neuron or a muscle, etc.) is
called the __________.
a. synapse
b. junction
c. connection
d. axoaxonal target